ช่วยดูโค้ดให้หน่อยค่ะ ไม่รู้ว่าผิดตรงไหน เกี่ยวกับอัพโหลดภาพ php

<?php
include("../include/connect.php");
$pj_id2=$_POST['ch_project_id'];
$ch_post_img= $_POST["img_pj"];

$ch_project_img=date("YmdHis")."_".$_FILES['fileupload1']['name'];
$temp_file=$_FILES['fileupload1']['tmp_name'];//ตำแหน่งของ tmp file
if ($ch_project_img !=""){
	$update=",ch_project_img='$ch_project_img' ";
	copy ($temp_file,"../upload/$ch_project_img"); 
	@unlink("../upload/$ch_post_img");	
}




		$strSQL = "UPDATE  ch_project_us ";
		$strSQL .=" SET ch_project_name = '".$_POST["ch_project_name"]."',ch_project_deTail = '".$_POST["ch_project_deTail"]."',ch_project_by = '".$_POST["ch_project_by"]."',ch_project_dateAdd = '".date("Y-m-d H:i:s")."' $update  WHERE ch_project_id = '".$_POST["ch_project_id"]."' ";
		$objQuery = mysql_query($strSQL);			


	echo "<center><h2>เรียบร้อย</h2></center>" ;
?>

<form name="myform" action="save_edit_project.php" method="post" enctype="multipart/form-data" onsubmit="return clickupload();" >
&raquo; แก้ไขข้อมูล รหัส &nbsp;<?=$_GET['pj_id2'];?>
<input type="hidden" name="ch_project_id" value="<?=$_GET['pj_id2']; ?>" />
<table border="0"  cellpadding="3" cellspacing="0" width="95%" title="เพิ่มโปรเจค"  bordercolor="#D3D3D3" style="margin:20px;">
<tr>
<td style="border-bottom:1px dotted #BABABA;">ชื่อโครงการ :</td><td style="border-bottom:1px dotted #BABABA;">
<input type="text" value="<?=$obj['ch_project_name'];?>"  size="50" style="height:25px;" name="ch_project_name" id="title" />
</td>
</tr>
<tr>
<td style="border-bottom:1px dotted #BABABA;">รายละเอียดโครงการ :</td><td style="border-bottom:1px dotted #BABABA;">
<input type="text" value="<?=$obj['ch_project_deTail'];?>"  size="100" style="height:25px;" name="ch_project_deTail" id="title" />
</td>
</tr>

<tr>
<td colspan="2" style="height:50px;"></td>
</tr>

<tr><td >โดย</td><td><input type="text" value="<?=$obj['ch_project_by'];?>" name="ch_project_by"   size="50" style="height:25px;" /></td></tr>

<tr><td style="border-bottom:1px dotted #BABABA;" colspan="2" ></td></tr>

<tr>
<td colspan="2" style="height:20px;"></td>
</tr>

<tr>
<td style="border-bottom:1px dotted #BABABA;" >ไฟล์ภาพประกอบ</td><td style="border-bottom:1px dotted #BABABA;" >
<div style="width:50px; height:50px; border:1px solid #09F;"><img src="../upload/<?=$obj['ch_project_img'];?>" border="0" width="50" height="50" /></div><br />
<input type="file" value="<?=$obj['ch_project_img'];?>" name="fileupload1"   size="50" style="height:25px;" /><input type="hidden" value="<?=$obj['ch_project_img'];?>" name="img_pj" />
<font color="red" size="2">(Gif, Jpg, Png)</font><br>
</td>
</tr>


</table>
<input  type="submit" id="btn" value="บันทึก"/>
</form>